What are the spring design patterns?

spring design patterns include: 1. Dependency injection and control inversion; 2. Factory pattern; 3. Template pattern; 4. Observer pattern; 5. Decorator pattern; 6. Singleton pattern; 7. Strategy mode and adapter mode, etc. Detailed introduction: 1. Dependency injection and inversion of control: These two design patterns are the core of the Spring framework. Through dependency injection, Spring is responsible for managing and injecting dependencies between components, reducing the coupling between components. Inversion of control refers to handing over object creation and dependency management to the Spring container, etc.

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

A variety of design patterns are used in the Spring framework, some of the main design patterns include:

1. Dependency Injection (DI) and Inversion of Control (IoC): This Two design patterns are the core of the Spring framework. Through dependency injection, Spring is responsible for managing and injecting dependencies between components, reducing the coupling between components. Inversion of control refers to handing over object creation and dependency management to the Spring container, thus achieving object decoupling.

2. Factory Pattern: The Spring framework uses the factory pattern to create and manage object instances. Through the factory pattern, the Spring container is responsible for creating and managing the life cycle of objects, making the object creation process more flexible and configurable.

3. Template Pattern: Modules such as JdbcTemplate and RestTemplate in the Spring framework use the template pattern to encapsulate some common operations (such as database access, HTTP requests, etc.) in templates , allowing developers to focus on the implementation of business logic.

4. Observer Pattern: The event-driven mechanism in the Spring framework uses the Observer pattern. Through the observer pattern, the Spring framework implements an event publishing and subscription mechanism, allowing components to communicate and collaborate more flexibly.

5. Decorator Pattern: AOP (Aspect-Oriented Programming) in the Spring framework uses the decorator pattern, which uses dynamic proxy and other technologies without changing the original code. , add new behavior to the object.

6. Singleton Pattern: Beans in the Spring framework are singletons by default, that is, there is only one instance in the container. This singleton pattern design helps save resources and improve performance.

In addition to the design patterns listed above, the Spring framework also uses other design patterns, such as strategy pattern, adapter pattern, etc., to implement various functions and components. The use of these design patterns makes the Spring framework more flexible, extensible and easier to maintain.

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